I've used many brands of pest repellents, however they never had the options or covered as much area as these do. It's a great price for 4 of them. We were able to put 2 downstairs and 2 upstairs. We have a abig ant problem where we live. They even come thru the electrical outlet in our kitchen. I don't think they will now because I plugged this right into the outlet they come in at. Granted I've only used these for a few days however I love them already. I will update the review if need be.
Great pest repellent
SHINE HAI Ultrasonic Pest Repellent
These are great if you have bugs or ants in your house. I had little flies in my house and were very annoying . And I used these and i saw them rarely now. I think it's working great.
Great ultrasonic pest repeller
This SHINE HAI Ultrasonic pest repeller is turning out to be a great addition to our home. I have to say I am noticing less ants since we started using these. You just plug them into a socket and them do their job. It comes four to a pack. You do not want them outside of your rooms because the ultrasonic noise will not go through walls. You really need to put one in each room in your house. These ultrasonic pest repeller's will not harm humans or your pets. We have two cats and have noticed nothing out of the ordinary with them. Great product.